US20140104324A1 - Display apparatus and method of driving the same - Google Patents
Display apparatus and method of driving the same Download PDFInfo
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- US20140104324A1 US20140104324A1 US14/132,619 US201314132619A US2014104324A1 US 20140104324 A1 US20140104324 A1 US 20140104324A1 US 201314132619 A US201314132619 A US 201314132619A US 2014104324 A1 US2014104324 A1 US 2014104324A1
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3603—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals with thermally addressed liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0242—Compensation of deficiencies in the appearance of colours
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/041—Temperature compensation
Abstract
A display apparatus includes a temperature sensor, a timing controller, a data driver and a display panel. The temperature sensor senses a temperature, the timing controller includes a dynamic capacitance capture (“DCC”) block, which converts a green data, a red data and a blue data into a green compensation data, a red compensation data and a blue compensation data, respectively, based on the temperature sensed by the temperature sensor, and the data driver converts the red compensation data, the green compensation data and the blue compensation data into a data voltage and outputs the data voltage. The display panel receives the data voltage and displays an image.
Description
- This application is a continuation of U.S. patent application Ser. No. 12/756,682, filed on Apr. 8, 2010, which claims priority to Korean Patent Application No. 2009-85081, filed on Sep. 9, 2009, and all the benefits accruing therefrom under 35 U.S.C. §119, the content of which in its entirety is herein incorporated by reference.
- (1) Field of the Invention
- The following description relates to a display apparatus and a method of driving the display apparatus. More particularly, the following description relates to a display apparatus which effectively prevents a color blurring phenomenon and a method of driving the display apparatus.
- (2) Description of the Related Art
- A liquid crystal display typically includes two substrates facing each other and a liquid crystal layer interposed between the two substrates.
- The liquid crystal display is widely used in various electric appliances, such as a computer monitor, a television set and other similar electric appliances which display moving images, for example. However, the liquid crystal display has disadvantages when displaying moving images, due to a slow response speed of liquid crystal molecules in the liquid crystal layer. Accordingly, various schemes have been suggested to improve the response speed of the liquid crystal molecules. In addition, a color compensation scheme has been developed to improve color characteristics of the liquid crystal display.
- However, when the abovementioned schemes are applied together in a liquid crystal display, a color blurring phenomenon occurs, due to a response speed difference among pixels.
- Exemplary embodiments of the present invention relate to a display apparatus which effectively reduces a response speed difference between pixels and thereby prevents color blurring phenomenon.
- Exemplary embodiments of the present invention also relate to a method of driving the display apparatus.
- In exemplary embodiments of the present invention, a display apparatus includes a temperature sensor, a timing controller, a data driver and a display panel. The temperature sensor senses a temperature. The timing controller includes a dynamic capacitance capture (“DCC”) block which converts a green data, a red data and a blue data into a green compensation data, a red compensation data and a blue compensation data, respectively, based on the temperature sensed by the temperature sensor.
- The data driver converts the red compensation data, the green compensation data and the blue compensation data into a data voltage and outputs the data voltage. The display panel receives the data voltage and displays an image.
- In exemplary embodiments of the present invention, a method of driving a display apparatus includes sensing a temperature, converting a green data, a red data and a blue data into a green compensation data, a red compensation data and a blue compensation data, respectively, based on the temperature, converting the red compensation data, the green compensation data and the blue compensation data into a data voltage, and receiving the data voltage and displaying an image based on the data voltage.
- In exemplary embodiments, the DCC block compensates for each of the red, green and blue data based on different correction values, thus a response speed difference between red, green and blue sub-pixels is substantially decreased. Accordingly, a color blurring phenomenon on a screen of the display apparatus is effectively prevented.
- The above and other aspects and features of the present invention will become more apparent by describing in further detail exemplary embodiments thereof with reference to the accompanying drawings, in which:
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FIG. 1 is a block diagram of an exemplary embodiment of a display apparatus according to the present invention; -
FIG. 2 is a block diagram of an exemplary embodiment of a timing controller of the display apparatus ofFIG. 1 ; -
FIG. 3 is a graph of output gray scale versus input gray scale showing output gray scale values of corrected red, green and blue data versus input gray scale values of red, green and blue data of an accurate color capture (“ACC”) block of the timing controller ofFIG. 2 ; -
FIG. 4 is a plan view of an exemplary embodiment of an electrically erasable programmable read-only memory (“EEPROM”) of the display apparatus ofFIG. 1 ; -
FIG. 5 is a block diagram of an exemplary embodiment of a dynamic capacitance capture (“DCC”) block of the timing controller ofFIG. 2 ; -
FIG. 6 is a block diagram of another exemplary embodiment of a DCC block of the timing controller ofFIG. 2 ; -
FIG. 7 is a plan view of another exemplary embodiment of an EEPROM of the display apparatus ofFIG. 1 ; -
FIG. 8 is a block diagram of an exemplary embodiment of a DCC block that refers to look-up tables in the EEPROM ofFIG. 7 ; -
FIG. 9 is a graph of correction values versus gray scale values showing red and blue offsets of the DCC block ofFIG. 8 ; -
FIG. 10 is a block diagram of another exemplary embodiment of a DCC block that refers to the look-up tables in the EEPROM ofFIG. 7 ; -
FIG. 11 is a block diagram of another exemplary embodiment of a DCC block of the timing controller ofFIG. 2 ; and -
FIG. 12 is a block diagram of another exemplary embodiment of a timing controller of the display apparatus ofFIG. 1 . - The invention now will be described more fully hereinafter with reference to the accompanying drawings, in which various embodiments are shown. This invention may, however, be embodied in many different forms, and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like reference numerals refer to like elements throughout.
- It will be understood that when an element is referred to as being “on” another element, it can be directly on the other element or intervening elements may be present therebetween. In contrast, when an element is referred to as being “directly on” another element, there are no intervening elements present. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.
- It will be understood that, although the terms first, second, third etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present invention.
- The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used herein, the singular forms “a,” “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” or “includes” and/or “including” when used in this specification, specify the presence of stated features, regions, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, components, and/or groups thereof.
- Furthermore, relative terms, such as “lower” or “bottom” and “upper” or “top,” may be used herein to describe one element's relationship to another element as illustrated in the Figures. It will be understood that relative terms are intended to encompass different orientations of the device in addition to the orientation depicted in the Figures. For example, if the device in one of the figures is turned over, elements described as being on the “lower” side of other elements would then be oriented on “upper” sides of the other elements. The exemplary term “lower,” can therefore, encompasses both an orientation of “lower” and “upper,” depending on the particular orientation of the figure. Similarly, if the device in one of the figures is turned over, elements described as “below” or “beneath” other elements would then be oriented “above” the other elements. The exemplary terms “below” or “beneath” can, therefore, encompass both an orientation of above and below.
- Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
- Exemplary embodiments are described herein with reference to cross section illustrations that are schematic illustrations of idealized embodiments. As such, variations from the shapes of the illustrations as a result, for example, of manufacturing techniques and/or tolerances, are to be expected. Thus, embodiments described herein should not be construed as limited to the particular shapes of regions as illustrated herein but are to include deviations in shapes that result, for example, from manufacturing. For example, a region illustrated or described as flat may, typically, have rough and/or nonlinear features. Moreover, sharp angles that are illustrated may be rounded. Thus, the regions illustrated in the figures are schematic in nature and their shapes are not intended to illustrate the precise shape of a region and are not intended to limit the scope of the present claims.
- Hereinafter, exemplary embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
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FIG. 1 is a block diagram of an exemplary embodiment of a display apparatus according to the present invention, andFIG. 2 is a block diagram of an exemplary embodiment of a timing controller of the display apparatus ofFIG. 1 . - As shown in
FIG. 1 , adisplay apparatus 100 includes atemperature sensor 110, atiming controller 120, an electrically erasable programmable read-only memory (“EEPROM”) 131, aframe memory 132, adata driver 140, agate driver 150 and adisplay panel 160. - The
temperature sensor 110 senses an ambient temperature and provides a temperature data Temp corresponding to the ambient temperature to thetiming controller 120. - The
timing controller 120 receives a control signal CS and a present image signal Gn from an external source (not shown). The present image signal Gn includes red data RDn, green data GDn and blue data BDn. When the present image signal Gn is provided to thetiming controller 120, thetiming controller 120 reads out a previous image signal Gn-1 from theframe memory 132 and writes the present image signal Gn in theframe memory 132. - As shown in
FIG. 2 , thetiming controller 120 includes an accurate color capture (“ACC”) block 121, a dynamic capacitance capture (“DCC”) block 122, adata processing block 123 and a controlsignal generating block 124. - The
ACC block 121 performs gamma corrections on the red, green and blue data RDn, GDn and BDn based on gamma correction values determined according to gamma characteristics of thedisplay apparatus 100, and outputs corrected red, green and blue data A-RDn, A-GDn and A-BDn, respectively. When red, green and blue gamma characteristics of thedisplay apparatus 100 are different from one another, a brightness of the red data RDn, a brightness of the green data GDn and a brightness of blue data BDn are different from one another for a given corresponding, e.g., same, gray scale value. In an exemplary embodiment, the brightness of the blue data BDn is high (relative to the red and green data), the brightness of the red data RDn is relatively low, and the brightness of the green data GDn is intermediate between the brightness of the blue data BDn and the brightness of the red data RDn. - To compensate for the brightness differences among the red, green and blue data RDn, GDn and BDn, respectively, the ACC block 121 sets a reference gamma characteristic (e.g., a gamma value of 2.2) and sets differences between the reference gamma characteristic and each of the red, green and blue gamma characteristics for every gray scale values as the gamma correction values. Accordingly, the gamma correction values corresponding to the red, green and blue data RDn, GDn and BDn may be added to or subtracted from the red, green and blue data RDn, GDn and BDn by the
ACC block 121, and the brightness differences are thereby compensated. -
FIG. 3 is a graph of output gray scale versus input gray scale showing output gray scale value of corrected red, green and blue data versus input gray scale value of red, green and blue data of the ACC block of the timing controller ofFIG. 2 . InFIG. 3 , a first graph A1 indicates the output gray scale values according to the input gray scale values of the green data, a second graph A2 indicates the output gray scale values according to the input gray scale values of the red data, and a third graph A3 indicates the output grays scale values according to the input grays scale values of the blue data. - As shown in
FIG. 3 , although the red, green and blue data RDn, GDn and BDn in a same gray scale value are provided to theACC block 121, theACC block 121 compensates for the red, green and blue data RDn, GDn and BDn to have different gray scale values, and thereby substantially decreases the brightness difference.FIG. 3 shows an example that the red, green and blue data RDn, GDn and BDn expand bit numbers thereof by the compensation of theACC block 121, which are greater than bit numbers before the red, green and blue data RDn, GDn and BDn are input to theACC block 121. In an exemplary embodiment, the ACC block 121 may receive the red, green and blue data RDn, GDn and BDn having 512 gray scale level and outputs the corrected green data A-GDn having 2048 gray scale level, the corrected red data A-RDn having gray scale level higher than 2048 gray scale level, and the corrected blue data A-BDn having gray scale level lower than 2048 gray scale level. Thus, white color coordinates according to the corrected red, green and blue data A-RDn, A-GDn and A-BDn is substantially uniformly maintained with respect to all gray scale levels, and thereby color characteristics of thedisplay apparatus 100 are substantially improved. - In an exemplary embodiment, to improve the response speed of a present frame, the DCC block 122 shown in
FIG. 2 compensates for the gray scale values of the present image signal Gn based on correction values that are determined according to the gray scale difference between the present image signal Gn and the previous image signal Gn-1. In an exemplary embodiment, the DCC block 122 increases the gray scale value of the present image signal Gn above target gray scale levels. In an exemplary embodiment, the DCC block 122 may compensate for the response speed of each of the corrected red, green and blue data A-RDn, A-GDn and A-BDn that have been color-compensated by theACC block 121. - To this end, the
EEPROM 131 may store a red look-up table including a red correction value used to compensate the corrected red data A-RDn, a green look-up table including a green correction value used to compensate the corrected green data A-GDn, and a blue look-up table including a blue correction value used to compensate the corrected blue data A-BDn. Accordingly, the DCC block 122 converts the corrected red data A-RDn into red compensation data D-RDn by compensating for the corrected red data A-RDn based on the red correction value of the red look-up table, converts the corrected green data A-GDn into green compensation data D-GDn by compensating for the corrected green data A-GDn based on the green correction value of the green look-up table, and converts the corrected blue data A-BDn into blue compensation data D-BDn by compensating for the corrected blue data A-BDn based on the blue correction value of the blue look-up table. - In an exemplary embodiment, when the response speed of the
display apparatus 100 varies according to temperature change, the red, green and blue correction values may be set different from one another according to the temperature data Temp output from thetemperature sensor 110. In an exemplary embodiment, when the response speed of thedisplay apparatus 100 becomes faster as the temperature increases, each of the red, green and blue correction value decreases, and when the response speed of thedisplay apparatus 100 becomes slower as the temperature decreases, the each of the red, green and blue correction value increases. -
FIG. 4 is a plan view of an exemplary embodiment of the EEPROM of the display apparatus ofFIG. 1 . - As shown in
FIG. 4 , theEEPROM 131 may include red look-up tables, e.g., a first red look-up table to an m-th red look-up table R_LUT1 to R_LUTm, including red correction values different from one another according to predetermined temperatures, green look-up tables, e.g., a first green look-up table to an m-th green look-up table G_LUT1 to G_LUTm, including green correction values different from one another according to the predetermined temperatures, and blue look-up tables, e.g., a first blue look-up table to an m-th blue look-up table B_LUT1 to B_LUTm, including blue correction values different from one another according to the predetermined temperatures. In an exemplary embodiment, thetiming controller 120 generates a selection signal Temp_sel corresponding to the temperature data Temp provided from thetemperature sensor 110, and thereby selects one of the red look-up tables, e.g., one of the first red look-up table to the m-th red look-up table R_LUT1 to R_LUTm, one of the green look-up table, e.g., one of the first green look-up table to the m-th green look-up table G_LUT1 to G_LUTm, and one of the blue look-up table, e.g., one of the first blue look-up table to the m-th blue look-up table B_LUT1 to B_LUTm. In an exemplary embodiment, the DCC block 122 may compensate for the corrected red, green and blue data A-RDn, A-GDn and A-BDn with reference to the one of the red, green and blue look-up tables selected by thetiming controller 120, e.g., a selected red look-up table R_LUT_sel, a selected green look-up table G_LUT_sel and a selected blue look-up table B_LUT_sel. - The
DCC block 122 will be described in greater detail below with reference toFIGS. 4 to 10 . - The
data processing block 123 generates converted red, green and blue data RDn′, GDn′ and BDn′ by converting a data format of each of the red, green and blue compensation data D-RDn, D-GDn and D-BDn generated by theDCC block 122 and provides the converted red, green and blue data RDn′, GDn′ and BDn′ to thedata driver 140. - The control
signal generating block 124 generates a data control signal D_CS and a gate control signal G_CS based on the control signal CS received from an external source. The control signal CS may include a vertical synchronizing signal, a horizontal synchronizing signal, a main clock, a data enable signal and other similar signals, for example. - Referring again to
FIG. 1 , the data control signal D_CS serves as a signal that controls a drive of thedata driver 140 and is provided to thedata driver 140. The data control signal D_CS may include a horizontal start signal that starts a driving of thedata driver 140, an inversion signal that inverts a polarity of data voltages, and an output indicating signal that decides an output timing of the data voltages from thedata driver 140. - The gate control signal G_CS is a signal that controls a driving of the
gate driver 150 and is provided to thegate driver 150. The gate control signal G_CS may include a vertical start signal that starts the drive of thegate driver 150, a gate clock signal that determines an output timing of a gate pulse, and an output enable signal that determines a pulse width of the gate pulse. - The
data driver 140 receives the converted red, green and blue data RDn′, GDn′ and BDn′ in synchronization with the data control signal D_CS from thetiming controller 120. Thedata driver 140 receives gamma reference voltages generated by a gamma reference voltage generator (not shown) and converts the converted red, green and blue data RDn′, GDn′ and BDn′ into the data voltages, e.g., a first data voltage to an m-th data voltage D1 to Dm, respectively, based on the gamma reference voltages. - The
gate driver 150 receives a gate-on voltage Von and a gate-off voltage from a voltage generator (not shown) and outputs gate signals, e.g., a first gate signal to an m-th gate signal G1 to Gn, respectively, which swing between the gate-on voltage Von and the gate-off voltage Voff in synchronization with the gate control signal D_CS from thetiming controller 120. - The
display panel 160 includes pixels, and the pixels respond to the gate signals, e.g., the first gate signal to the m-th gate signal G1 to Gn, to provide the data voltage, e.g., the first data voltage to the m-th data voltage D1 to Dm to pixels disposed in a corresponding pixel row. Accordingly, each of the pixels disposed in the corresponding pixel row is charged with corresponding data voltages, light transmittance of a liquid crystal layer is controlled according to the level of the charged data voltages, and thereby the display panel displays predetermined images on thedisplay panel 160. - In another exemplary embodiment, the
timing controller 120 may be a chip-type component, and although not shown in figures, theEEPROM 131 and theframe memory 132 may be disposed in thetiming controller 120 as a type of chip. -
FIG. 5 is a block diagram of an exemplary embodiment of the DCC of the timing controller ofFIG. 2 . - As shown in
FIG. 5 , theDCC block 122 includes a green data compensator G_DCC, a red data compensator R_DCC, and a blue data compensator B_DCC. - The green data compensator G_DCC selects a green look-up table, e.g., the selected green look-up table G_LUT_sel, corresponding to a sensed temperature among the green look-up tables, e.g., the first green look-up table to the m-th green look-up table G_LUT1 to G_LUTm, stored in the
EEPROM 131 and compensates for the corrected green data A-GDn using the green correction value IG of the selected green look-up table G_LUT_sel. - The
frame memory 132 shown inFIG. 1 stores N-bit data of the present image signal Gn and upper m-bit data of the previous image signal Gn-1 during one frame, where “m” is a natural number equal to or greater than “1” and “N” is a natural number greater than “m.” - The selected green look-up table G_LUT_sel receives upper m-bit data of the corrected green data A-GDn of a present frame and m-bit data of corrected green data A-GDn-1 of a previous frame stored in the
frame memory 132 and thereby outputs m-bit data of the green correction value IG. Thus, the green data compensator G_DCC outputs N-bit data of the green compensation data D-GDn using the green correction value IG and lower bit data of the green data A-GDn of the present frame. In an exemplary embodiment, a gray scale level of the green compensation data D-GDn is higher than a gray scale level of the corrected green data A-GDn to improve the response speed. - The red data compensator R_DCC selects a red look-up table, e.g., the selected red look-up table R_LUT_sel, corresponding to the sensed temperature among the red look-up tables, e.g., the first red look-up table to the m-th red look-up table R_LUT1 to R_LUTm, and compensates for the corrected red data A-RDn using the red correction value IR of the selected red look-up table R_LUT_sel.
- The selected red look-up table R_LUT_sel receives upper m-bit data of the corrected red data A-RDn of the present frame and m-bit data of corrected red data A-RDn-1 of the previous frame stored in the
frame memory 132 to output m-bit data of the red correction value IR. Thus, the red data compensator R_DCC outputs N-bit data of the red compensation data D-RDn using the red correction value IR and lower bit data of the corrected red data A-RDn of the present frame. In an exemplary embodiment, a gray scale level of the red compensation data D-RDn is higher than a gray scale level of the corrected red data A-RDn to improve the response speed. - The blue data compensator B_DCC selects a blue look-up table, e.g., the selected blue look-up table B_LUT_sel, corresponding to the sensed temperature among the blue look-up tables, e.g., the first blue look-up table to the m-th blue look-up table B_LUT1 to B_LUTm, and compensates for the corrected blue data A-BDn using the blue correction value IB of the selected blue look-up table B_LUT_sel.
- The selected blue look-up table B_LUT_sel receives upper m-bit data of the corrected blue data A-BDn of the present frame and m-bit data of corrected blue data A-BDn-1 of the previous frame stored in the
frame memory 132 to output m-bit data of the blue correction value IB. The blue data compensator B_DCC outputs N-bit data of the blue compensation data D-BDn using the blue correction value IB and lower bit data of the corrected blue data A-BDn of the present frame. In an exemplary embodiment, a gray scale level of the blue compensation data D-BDn is higher than a gray scale level of the corrected blue data A-BDn to improve the response speed. - As described above, the
DCC block 122 compensates for the response speed of each of the red, green and blue data A-RDn, A-GDn and A-BDn that are color-compensated by the ACC block 121 using the red, green and blue data compensators R_DCC, G_DCC and B_DCC, respectively, so that the response speed difference due to the gray scale difference of the corrected red, green and blue data A-RDn, A-GDn and A-BDn may be effectively prevented from occurring between the red, green and blue sub-pixels. As a result, the color blurring phenomenon occurred on the screen of thedisplay apparatus 100 is effectively prevented. -
FIG. 6 is a block diagram of another exemplary embodiment of the DCC of the timing controller ofFIG. 2 . - In an exemplary embodiment, the
EEPROM 131 may store a reference green look-up table G_LUT_ref, a reference red look-up table R_LUT_ref, and a reference blue look-up table B_LUT_ref therein. The reference green look-up table G_LUT_ref stores a green correction value corresponding to a reference temperature therein, the reference red look-up table R_LUT_ref stores a red correction value corresponding to the reference temperature therein, and the reference blue look-up table B_LUT_ref stores a blue correction value corresponding to the reference temperature therein. In an exemplary embodiment, the number of the look-up tables stored in theEEPROM 131 may be reduced to three, but not being limited thereto. - As shown in
FIG. 6 , the reference green look-up table G_LUT_ref receives upper m-bit data of the corrected green data A-GDn of a present frame and m-bit data of the corrected green data A-GDn-1 of a previous frame stored in theframe memory 132 and thereby outputs m-bit data of the green correction value IG. - The reference red look-up table R_LUT_ref receives upper m-bit data of the corrected red data A-RDn of the present frame and m-bit data of the corrected red data A-RDn-1 of the previous frame stored in the
frame memory 132 and thereby outputs m-bit data of the red correction value IR. - The reference blue look-up table B_LUT_ref receives upper m-bit data of the corrected blue data A-BDn of the present frame and m-bit data of the corrected blue data A-BDn-1 of the previous frame stored in the
frame memory 132 and thereby outputs m-bit data of the blue correction value IB. - In an exemplary embodiment, the
DCC block 122 includes a green data compensator G_DCC, a red data compensator R_DCC and a blue data compensator B_DCC. - The green data compensator G_DCC multiplies the green correction values IG output from the reference green look-up table G_LUT_ref by a first weight Wa varied according to the temperature sensed by the
temperature sensor 110 inFIG. 1 and thereby generates a first correction value I1. Accordingly, the green data compensator G_DCC may convert the corrected green data A-GDn into the green compensation data D-GDn based on the first correction value I1. - The red data compensator R_DCC multiplies the red correction value IR output from the reference red look-up table R_LUT_ref by a second weight Wb varied according to the sensed temperature and thereby generates a second correction value I2. Accordingly, the red data compensator R_DCC may convert the corrected red data A-RDn into the red compensation data D-RDn based on the second correction value I2.
- The blue data compensator B_DCC multiplies the blue correction value IB output from the reference blue look-up table B_LUT_ref by a third weight Wc varied according to the sensed temperature and thereby generates a third correction value I3. Accordingly, the blue data compensator B_DCC may convert the corrected blue data A-BDn into the blue compensation data D-BDn based on the third correction value I3.
- In an exemplary embodiment, each of the first, second and third weights Wa, Wb and Wc decreases when the sensed temperature is higher than the reference temperature and increases when the sensed temperature is lower than the reference temperature.
-
FIG. 7 is a plan view of another exemplary embodiment of the EEPROM of the display apparatus ofFIG. 1 ,FIG. 8 is a block diagram of another exemplary embodiment of the DCC that refers to look-up tables in the EEPROM ofFIG. 7 , andFIG. 9 is a graph of correction values versus gray scale values showing red and blue offsets of the DCC ofFIG. 8 . - As shown in
FIG. 7 , anEEPROM 131 may include green look-up tables, e.g., the first green look-up table to the m-th green look-up table G_LUT1 to G_LUTm, each including a green correction value corresponding to different temperatures. In an exemplary embodiment, theEEPROM 131 may include four or eight green look-up tables. Accordingly, thetiming controller 120 generates the selection signal Temp_sel corresponding to the temperature data Temp provided from thetemperature sensor 110 and thereby selects one green look-up table (hereinafter referred to as “the selected green look-up table G_LUT_sel”) among the green look-up tables, e.g., the first green look-up table to the m-th green look-up table G_LUT1 to G_LUTm included in theEEPROM 131. - Referring to
FIG. 8 , the selected green look-up table G_LUT_sel receives upper m-bit data of the green data A-GDn of a present frame and m-bit data of green data A-GDn-1 of a previous frame stored in theframe memory 132 and thereby outputs m-bit data of the green correction value IG. - Referring again to
FIG. 8 , theDCC block 122 includes a green data compensator G_DCC, a red data compensator R_DCC and a blue data compensator B_DCC. - The green data compensator G_DCC outputs the green compensation data D-GDn based on the green compensation value IG and lower bit data of the green data A-GDn of the present frame.
- The red data compensator R_DCC acquires red correction value IR by adding a red offset R_offset to the green correction value IG stored in the selected green look-up table G_LUT_sel and compensates for the red data A-RDn based on the red correction value IR.
- The blue data compensator B_DCC acquires blue correction values IB by adding a blue offset B_offset to the green correction value IG stored in the selected green look-up table G_LUT_sel and compensates for the blue data A-BDn based on the blue correction value IB.
- The selected green look-up table G_LUT_sel may further receive upper m-bit data of the red data A-RDn of the present frame and m-bit data of red data A-RDn-1 of the previous frame stored in the
frame memory 132 and thereby output m-bit data of a red measuring value, and receive upper m-bit data of the blue data A-BDn of the present frame and m-bit data of blue data A-BDn-1 of the previous frame stored in theframe memory 132 and thereby output m-bit data of a blue measuring value. - In this case, the red offset R_offset is defined by a difference between the green correction value IG and the red measuring value, and the blue offset B_offset is defined by a difference between the green correction value IG and the blue measuring value.
- Referring to
FIG. 9 , a fourth graph D1 and a fifth graph E1 represent the green correction value of the green look-up table according to the gray scale value of the present frame data, a sixth graph D2 and a seventh graph E2 represent the red measuring value of the green look-up table according to the gray scale value of the present frame data, and an eighth graph D3 and a ninth graphs E3 represent the blue measuring value of the green look-up table according to the gray scale value of the present frame data. - Referring again to
FIG. 9 , the red offset R_offset defined by the difference between the green correction value IG and the red measuring value may have a value in a range from a minimum red offset R_offset_min (for example, about −40) to a maximum red offset R_offset_max (for example, about 96). The blue offset B_offset defined by the difference between the green correction value IG and the blue measuring value may have a value in a range from a minimum blue offset B_offset_min (for example, about −108) to a maximum blue offset B_offset_max (for example, about 176). - In an exemplary embodiment, the red and blue offsets R_offset and B_offset may be converted to 8-bit data (from about −127 to about +128) or 10-bit data (from about −511 to about +512) to be added to the green correction value IG. Accordingly, each of the red and blue offsets R_offset and B_offset may be in 8-bit set, e.g., from −127 to +128, or in 10-bit set, e.g., from −511 to +512.
-
FIG. 10 is a block diagram of another exemplary embodiment of the DCC that refers to the look-up tables in the EEPROM ofFIG. 7 . - Since the DCC block 122 shown in
FIG. 10 refers to the look-up tables in theEEPROM 131 ofFIG. 7 , thetiming controller 120 generates the selection signal Temp_sel corresponding to the temperature data Temp provided from thetemperature sensor 110 and selects one green look-up table, e.g., the selected green look-up table G_LUT_sel, among the green look-up tables, e.g., the first green look-up table to the mi-th green look-up table G_LUT1 to G_LUTm, included in theEEPROM 131. The selected green look-up table G_LUT_sel receives upper m-bit data of the green data A-GDn of a present frame and m-bit data of green data A-GDn-1 of a previous frame stored in theframe memory 132 and outputs an m-bit green correction value IG. - In addition, the selected green look-up table G_LUT_sel receives upper m-bit data of the red data A-RDn of the present frame and m-bit data of red data A-RDn-1 of the previous frame stored in the
frame memory 132 and thereby outputs an m-bit red measuring value, and receives upper m-bit data of the blue data A-BDn of the present frame and m-bit data of blue data A-BDn-1 of the previous frame stored in theframe memory 132 and thereby outputs an m-bit blue measuring value. - Referring to
FIG. 10 , the green data compensator G_DCC of the DCC block 122 outputs N-bit data of the green compensation data D-GDn based on the green correction value IG and lower bit data of the green data A-GDn of the present frame. - The red data compensator R_DCC generates a second red offset R_offset2 by multiplying a first red offset R_offset1 by a red weight Wb, and acquires the red correction value IR by adding the second red offset R_offset2 to the green correction value IG. In this case, the first red offset R_offset1 is defined by a difference between the green correction value IG and the red measuring value. In addition, the red weight Wb may be varied according to the level of the temperature data Temp. Accordingly, the red data compensator R_DCC outputs N-bit data of the red compensation data D-RDn based on the red correction value IR and the lower bit data of the red data A-RDn of the present frame.
- The blue data compensator B_DCC generates a second blue offset B_offset2 by multiplying a first blue offset B_offset1 by a blue weight Wc, and acquires the blue correction value IB adds the second blue offset B_offset2 to the green correction value IG. In this case, the first blue offset B_offset1 is defined by a difference between the green correction value IG and the blue measuring value. In addition, the blue weight Wb may be varied according to the level of the temperature data Temp. Accordingly, the blue data compensator B_DCC outputs N-bit data of the blue compensation data D-BDn based on the blue correction value IB and the lower bit data of the blue data A-BDn of the present frame.
-
FIG. 11 is a plan view of another exemplary embodiment of the DCC. - The
DCC block 122 shown inFIG. 12 may refer to the look-up tables in theEEPROM 131, e.g., a reference green look-up table G_LUT_ref determined corresponding to a reference temperature. In an exemplary embodiment, the reference green look-up table G_LUT_ref receives upper m-bit data of the green data A-GDn of a present frame and m-bit data of green data A-GDn-1 of a previous frame stored in theframe memory 132, and outputs m-bit data of the green correction values IG. - Referring to
FIG. 11 , theDCC block 122 includes a green data compensator G_DCC, a red data compensator R_DCC and a blue data compensator B_DCC. - The green data compensator G_DCC generates a first correction value I1 by multiplying the green correction value IG output from the reference green look-up table G_LUT_ref by a first weight Wa determined based on the temperature data Temp provided from the
temperature sensor 110 shown inFIG. 1 . Accordingly, the green data compensator G_DCC may convert the corrected green data A-GDn into the green compensation data D-GDn based on the first correction value I1. - The red data compensator R_DCC generates a second red offset R_offset2 by multiplying a first red offset R_offset1 by a second weight Wb and acquires the red correction value IR by adding the second red offset R_offset2 to the green correction values IG. In this case, the first red offset R_offset1 is defined by a difference between the green correction value IG and the red measuring value. In addition, the second weight Wb may be varied according to the level of the temperature data Temp. Accordingly, the red data compensator R_DCC may convert the corrected red data A-RDn into the red compensation data D-RDn based on the red correction value IR.
- The blue data compensator B_DCC generates a second blue offset B_offset2 by multiplying a first blue offset B_offset1 by a third weight We and acquires the blue correction values IB by adding the second blue offset B_offset2 to the green correction value IG. In this case, the first blue offset B_offset1 is defined by a difference between the green correction value IG and the blue measuring value. In addition, the third weight Wb may be varied according to the level of the temperature data Temp. Accordingly, the blue data compensator B_DCC may convert the corrected blue data A-BDn into the blue compensation data D-BDn based on the blue correction value In.
- As described above, the
DCC block 122 compensates for the response speed of each of the corrected red, green and blue data A-RDn, A-GDn and A-BDn, which are color-compensated by theACC block 121, through the red, green and blue data compensators R_DCC, G_DCC and B_DCC, respectively, so that the response speed difference between the red, green and blue sub-pixels due to the gray scale difference of the corrected red, green and blue data A-RDn, A-GDn and A-BDn is effectively prevented. Accordingly, the color blurring phenomenon on the screen of thedisplay apparatus 100 is effectively prevented. - In an exemplary embodiment, the number of the look-up tables included in the
EEPROM 131 may vary according to the structure of the DCC block 122 shown inFIGS. 5 to 11 . That is, as the number of the look-up tables decreases, the size of theEEPROM 131 is effectively reduced. -
FIG. 12 is a block diagram of another exemplary embodiment of the timing controller of the display apparatus ofFIG. 1 . The same or like elements shown inFIG. 12 have been labeled with the same reference characters as used above to describe the exemplary embodiments of the timing controller shown inFIG. 2 , and any repetitive detailed description thereof will hereinafter be omitted or simplified. - Referring to
FIG. 12 , thetiming controller 170 includes aDCC block 171, anACC block 172, adata processing block 173 and a controlsignal generating block 174. Thetiming controller 170 inFIG. 12 is substantially the same as thetiming controller 120 shown inFIG. 2 except that theDCC block 171 is referenced prior to theACC block 172. - An exemplary embodiment of the DCC block 171 shown in
FIG. 12 may be one of the exemplary embodiments of the DCC blocks shown inFIGS. 5 to 11 . In TheDCC block 171 ofFIG. 12 , the color compensation is performed by theACC block 172 after compensating for the response speed with respect to each of the red, green and blue data RDn, GDn and BDn. Accordingly, although the red, green and blue data A-RDn, A-GDn and A-BDn color-compensated by the ACC block 172 are provided to thedisplay panel 160, the response speed difference between the red, green and blue sub-pixels is effectively prevented. - The present invention should not be construed as being limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concept of the present invention to those skilled in the art.
- While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit or scope of the present invention as defined by the following claims.
Claims (14)
1. A display apparatus comprising:
a temperature sensor which senses a temperature;
a timing controller, including a dynamic capacitance capture block, which converts a green data, a red data and a blue data into a green compensation data, a red compensation data and a blue compensation data, respectively, based on the temperature sensed by the temperature sensor;
green look-up tables including green compensation values different from one another and corresponding to predetermined temperatures;
red look-up tables including red compensation values different from one another and corresponding to the predetermined temperatures;
blue look-up tables including blue compensation values different from one another and corresponding to the predetermined temperatures;
a data driver which converts the red compensation data, the green compensation data and the blue compensation data into a data voltage and outputs the data voltage; and
a display panel which receives the data voltage and displays an image,
wherein the dynamic capacitance capture block comprises.
a green data compensator which selects a green look-up table corresponding to the temperature sensed by the sensing sensor from the green look-up tables and compensates for the green data based on a green compensation value of the green look-up table selected thereby;
a red data compensator which selects a red look-up table corresponding to the temperature sensed by the sensing sensor from the red look-up tables and compensates for the red data based on a red compensation value of the red look-up table selected thereby; and
a blue data compensator which selects a blue look-up table corresponding to the temperature sensed by the sensing sensor from the blue look-up tables and compensates for the blue data based on a blue compensation value of the blue look-up table selected thereby.
2. The display apparatus of claim 1 , further comprising an electrically erasable programmable read-only memory comprising the green look-up tables, red look-up tables and the blue look-up.
3. The display apparatus of claim 1 , further comprising a frame memory which stores N-bit data of a present frame data and upper m-bit data of a previous frame data during one frame,
wherein m is a natural number greater than or equal to one,
N is a natural number greater than m,
the green look-up table selected by the green data compensator receives upper m-bit data of a green data of a present frame and m-bit data of a green data of a previous frame and outputs m-bit data of the green compensation value,
the red look-up table selected by the red data compensator receives upper m-bit data of a red data of the present frame and m-bit data of a red data of the previous frame and outputs m-bit data of the red compensation value, and
the blue look-up table selected by the blue data compensator receives upper m-bit data of a blue data of the present frame and m-bit data of a blue data of the previous frame and outputs m-bit data of the blue compensation value.
4. The display apparatus of claim 3 , wherein
the green data compensator outputs N-bit data of the green compensation data based on the green compensation value and lower bit data of the green data of the present frame,
the red data compensator outputs N-bit data of the red compensation based on the red compensation value and lower bit data of the red data of the present frame, and
the blue data compensator outputs N-bit data of the blue compensation data using the blue compensation value and lower bit data of the blue data of the present frame.
5. The display apparatus of claim 1 , further comprising a frame memory which stores N-bit data of a present frame data and upper m-bit data of a previous frame data during one frame,
wherein m is a natural number equal to or greater than one,
N is a natural number greater than m,
the green look-up table receives upper m-bit data of a green data of a present frame and m-bit data of a green data of a previous frame stored in the frame memory and outputs m-bit data of the green compensation value,
the green look-up table receives upper m-bit data of a red data of the present frame and m-bit data of a red data of the previous frame stored in the frame memory and outputs m-bit data of a red measuring value, and
the green look-up table receives upper m-bit data of a blue data of the present frame and m-bit data of a blue data of the previous frame stored in the frame memory and outputs m-bit data of a blue measuring value.
6. The display apparatus of claim 5 , wherein
the red offset is defined by a difference between the green compensation value and the red measuring value, and
the blue offset is defined by a difference between the green compensation value and the blue measuring value.
7. The display apparatus of claim 5 , wherein
the red offset is defined by a value acquired by multiplying the difference between the green compensation value and the red measuring value by a red weight predetermined according to the temperature sensed by the sensing sensor, and
the blue offset is defined by a value acquired by multiplying the difference between the green compensation value and the red measuring value by a blue weight predetermined according to the temperature sensed by the sensing sensor.
8. The display apparatus of claim 1 , wherein
the timing controller further comprises an accurate color capture block which gamma corrects the red data, the green data and the blue data based on a gamma correction value and generates corrected red data, corrected green data and corrected blue data, and
the dynamic capacitance capture block receives the corrected red data, the corrected green data and the corrected blue data corrected by the accurate color capture block.
9. The display apparatus of claim 1 , wherein the timing controller further comprises an accurate color capture block which gamma corrects the red data, the green data and the blue data output from the dynamic capacitance capture block based on a gamma correction value and generates corrected red data, corrected green data and corrected blue data.
10. A display apparatus comprising:
a temperature sensor which senses a temperature;
a timing controller, including a dynamic capacitance capture block, which converts a green data, a red data and a blue data into a green compensation data, a red compensation data and a blue compensation data, respectively, based on the temperature sensed by the temperature sensor;
a green look-up table including a green compensation value corresponding to a reference temperature;
a red look-up table including a red compensation value corresponding to the reference temperature;
a blue look-up table including a blue compensation value corresponding to the reference temperature;
a data driver which converts the red compensation data, the green compensation data and the blue compensation data into a data voltage and outputs the data voltage; and
a display panel which receives the data voltage and displays an image,
wherein the dynamic capacitance capture block comprising:
a green data compensator which generates a first compensation value by multiplying the green compensation value by a first weight determined according to the temperature sensed by the sensing sensor and compensates for the green data based on the first compensation value;
a red data compensator which generates a second compensation value by multiplying the red compensation value by a second weight determined according to the temperature sensed by the sensing sensor and compensates for the red data based on the second compensation value; and
a blue data compensator which generates a third compensation value by multiplying the blue compensation value by a third weight determined according to the temperature sensed by the sensing sensor and compensates for the blue data based on the third compensation value.
11. The display apparatus of claim 10 , further comprising an electrically erasable programmable read-only memory comprising a green look-up table, a red look-up table, and a blue look-up table.
12. The display apparatus of claim 11 , wherein
each of a value of the first weight, a value of the second weight and a value of the third weight decreases as the temperature sensed by the temperature sensor increases when the temperature is greater than the reference temperature, and
each of the value of the first weight, the value of the second weight and the value of the third weight increases as the temperature sensed by the temperature sensor decreases when the temperature is less than the reference temperature.
13. A method of driving a display apparatus, the method comprising:
sensing a temperature by a temperature sensor;
selecting a green look-up table corresponding to the temperature sensed by the temperature sensor among green look-up tables and compensating for a green data based on a green compensation value of the green look-up table selected thereby;
selecting a red look-up table corresponding to the temperature sensed by the temperature sensor among red look-up tables and compensating for a red data based on a red compensation value of the red look-up table selected thereby;
selecting a blue look-up table corresponding to the temperature sensed by the temperature sensor among blue look-up tables and compensating for a blue data based on a blue compensation value of the blue look-up table selected thereby;
converting the green data, the red data and the blue data into a green compensation data, a red compensation data and a blue compensation data, respectively, based on the temperature;
converting the red compensation data, the green compensation data and the blue compensation data into a data voltage; and
receiving the data voltage and displaying an image based on the data voltage.
14. The method of driving a display apparatus, wherein
the green look-up tables configured to store green compensation values different from one another and corresponding to predetermined temperatures;
the red look-up tables configured to store red compensation values different from one another and corresponding to predetermined temperatures; and
the blue look-up tables configured to store blue compensation values different from one another and corresponding to predetermined temperatures.
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Also Published As
Publication number | Publication date |
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JP2011059657A (en) | 2011-03-24 |
CN102024436B (en) | 2015-03-25 |
KR101600492B1 (en) | 2016-03-22 |
US8665297B2 (en) | 2014-03-04 |
KR20110027128A (en) | 2011-03-16 |
US20110057959A1 (en) | 2011-03-10 |
CN102024436A (en) | 2011-04-20 |
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